dnd 5e – Are there any options to make undead animals in D&D 5e?

Two examples would be Negative Energy Flood and Danse Macabre.

Negative Energy Flood will create a zombie version of any creature it kills. Danse Macabre will raise up to 5 small or medium creatures as either zombies or skeletons (your choice).

Note that in both cases, the stats of the undead creatures are those of zombies/skeletons.